Condenser



April 24, 1928. 1,666,922

E. J. wlGGlNs CONDENSER Filed Aug. 9, 1923 Patented Apr. 24, 1928-.v

' 1,666,922- UNITED STATES Pa'rrfzNTv OFFICE.

EDWARD J'. WIGGINS, 0l' CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

' 'TO ELECTRICAL RESEARCH LABORATORIES, INC., OF CHICAGO, ILLINOIS, A CO3-,4 n

IOBATION OF DELAWARE.

connaissait,

Application led rAugust 9, 1923, Serial No. 656,586.

My invention relates to an electrical condenser more especially adapted for use in radio apparatus; the invention having for its object the rovision of a condenser of predetermined ed capacity and which w ill be sim le in construction and not readily in'ure or affected. i he advantages of my invention will be more readily comprehended from the de- 1 tail description of the drawing, wherein Figure 1 is a perspective view.

Figure 2 Ais a`cross sectional view taken on the line 2-2 ofFigure 1 looking in the directionof the arrows.

Figure 3 is a sectional plan view with portions broken away. Figure 4 is an enlarged detail sectional view of a portion of t e condenser, showing` manner of assembly.

The invention, in the particular exemplification, disclosed in the drawing, consists of a supportin plate o1'. shell 10 of suitable sheet metal initially rovided with upstanding sides 11 of suitab e height commensurate 7 -sides tobe bent inwardly across the various elements of the condenser, as shown at 12, 12 in Figures 1 and 2. The supporting plate or shell is preferably shown rectangular in form and -is intended to receive a suitable sheet of dielectric material such as mica, as at 13, see Fi re 4, extending throughout the length an width of the base portion of the supporting plate or shell 10.

superposed on the dielectric 13, and inalternate relation, are suitable metallic plates or conductor elements 14, 14 and 15, 15, with intervening dielectric material or sheets of mica 13, as more clearlyv shown in Figure 4. The conductor plates 14 and 15 are shown similar in construction and each provided with an extended lobe or ear vas at 16; the lobes or extensions of the plates 14 being disposed beyond .the same end of the supporting of the p ates 15'extend beyond the opposite end of the plate 10; the plates 14 and 15 being of suitable high conducting material v such as thin sheets of copper or assi; and the 4extensions or lobes 16 are aperturedy as at 17 to receive the lead linesor wires.

The'conductor plates 14 and 15 offsuitable highl conducting .materialare ably previouslyv coated `a thin with the size of condenser, to permit the late 10,- whilefthe lobes orears 16 the wax suitably applied, as by dipping the plates in the hot solution, so as lto leave a comparatively thin film on the surfaces of the plates.

After the elements thus far described have been properly assembled on the 'shell or supporting plate 10, with the lobes or extensions ofthe alternateplates extending beyond the ends of the shell or plate'lO as described, I prefer to place a comparatively rigidsheet metal plate 18 on top of the up-y permost dielectric 13.- a

After the various elements have been assembled as 'ust described, the upstanding sides 11 of t e shell'or supporting plate 10 are then bent and subjected to ressure, by means of a sultable press, in or er that the heavy metal may be bent over and onto the rigid non-flexing plate 18and thereby subject the various elements, through i'igid plate 18, to a uniform pressure throughout,

to regulate or determine the capacity of the n condenser. l i

The capacity of the condenser is not only determined b the number of conductor plates 14 an 15, but is also determined by the thickness of the dielectric used and the degree of pressure applied through the bending of the upstanding sides 11`oyer and onto the upper side ofthe condenser as shown at 12in Figures l and 2. The shell .or supporting plate '10 is made of heavy material suiiici'ent to provide a rigid shell and at the same time enable the bent-sides 12 to remain in the bent condition desired and therefore to retain the pressure-applying'relation with the superposed elements as, shown in Figures 1 and 2. It is also evident that by placing the comparatively heavy sheetl metal plate 18 on top of the various elements ofthe condenser, the pressure induced by the bent sides 12 will be distributed throughout the various conductor lates and dielectric and buckling of'the t in -metal conductor plates and dielectric alon the lon 'tudinal centerline of the con enser wil be prevented. c'

In the formation of my l denser, `namely whileipressure is being applied tothe bent side flanges 12, the condenseris also preferably heated byelectricity, in order that the thin film or coatin of sus4 icol

improved con?y v wax on the conductor plates lwill yiel to the .pressure and iiow with uniformity and consistency so as to ooze out about the edges of the conductor plates and provide a coating about the edges of the condenser which will prevent moisture entering between the su erpos'ed elements. p

ith my improved construction, the capacity of the condenser may be accurately determined and tested by the manufacturer and the predetermined capacity maintained; it being understood, of course, that the capacity of the condenser may be varied not l only by the number of conductor plates 'employed and the ermanent pressure maintained, but also y the thickness of the -d1- kelectric used. That is to say, by decreasing the thickness of the dielectric, the capacity may be increased; increasing the area of the conductor plates will also increase the capacity, while bending and pressing the side flanges 12 into firmer or closer contact with the pressure distributing plate 18 will also increase the capacity of the condenser,

' as such pressure will cause the conductor plates to be forced into closer contact with the mica and therefore into closer relation' with each other. On the other hand, positioning of the side flanges 12 'so as to apply less pressure on top of the plate 18 will have the same eifect as increasing the thickness of the dielectricv and therefore will decreasethe capacity of the condenser.

I prefer to employ a substance or wax of high melting point, for coating the conduc tor plates, in order that climatic conditions or temperatures will not affect the condenser. By heating `the condenser as stated, while subjecting it to pressure during the formation thereof to determine the permanent pressure applyin relation of the side flanges to the superpose plates, the coating ofwax on the. respective plates is made uniform and at the same time the wax coating reduced in thickness vand. a thinner dielectric therefore also provided vand the capacity I have shown-what I believe to be the simplest embodiment of m v improved condenser and method of pro ucing same, having described the same in terms employed merely as terms of description and not as terms of limitation, as structural modifications are possible and may be made Without, however, departing from the spirit of my invention.

What I claim is 1. A condenser ofthe character described, comprising'a plurality of thin sheet metal conductor plates, provided with terminal receiving ends, with the terminal of each alternate plate disposed beyond the same end of the condenser, said plates being separated by sheets of dielectric material and a sheet of dielectric material being disposed above and below the superposed elements, a nonilexible metallic late superposed on 4the uppermost sheet oiP dielectric material, a supporting metallic plate on which the conductor plates and dielectric material are superposed, said supporting plate being of greater width than the conductor plates and sheets of dielectric material, with both longitudinal sides of said supporting plate being bent upwardly and over onto the superposed l elements 'into pressure applying relation with said non-flexible metallic plate whereby uniformpressure is applied throughout the superposed conductor'plates and dielecf tric material, and a thin coating of moisture resisting material on the conductor plates and at the `ends of the condenser.

2. The herein described method of forming'a condenser, which consists in providin the metallic plates of conducting materia with a thin coat-ing of moistureV resisting material having a comparatively high melting point, superposing in alternate relation the conductorplates and intervening sheets of dielectric material on a rigid metallic supporting plate, bending the sides of said rigid metallic plate upward across the top .0f the superposed elements into pressure applying relation therewith, and electricall heatin the superposed elements while ben ing said sides of the supporting plate -into pressurel applying position, subjecting the condenser to a predetermined degree of pressure to cause the'moisture resistmg material to flow about the exposed ends of the superposed elements.

. EDWARD J. WIGGINS. 

